This is a recurring problem with my 2014 Suburban Z-71 4X4, first occurring at 2735 miles, and again at 19,367, 19,420, and 20,435 miles. While driving at or above 45 mph, the vehicle has exhibited the following symptoms: Loss of power while the "check engine, " "stabiltrak" and "traction control" warning lights appear. The vehicle information center reads "traction control: Off / stabiltrak: Off" followed by "service traction control" and "service stabiltrak." The readout then shows "engine power reduced." The vehicle will not maintain highway speeds, and requires flooring the accelerator and or shifting the transmission into "manual" mode in order to maintain a safe highway speed. Rpms exceed 3500 unless using manual transmission function. After re-starting the vehicle, some or all warning lights eventually disappear, and the vehicle appears to return to normal. When I took the vehicle to the dealer after the first incident, the vehicle was in service for four and a half days, and was returned with the following comments:"...looked into si and found a pip saying wiggle wires at different spots. Wiggled wires and drove no problems drove well [sic]. no cel on." The tech drove the vehicle for 30 miles and had no problems. A comment on my invoice stated "had pi stating that tech would probably not be able to duplicate concern - checked connectors as per ml." Initial response from service department on current problem set is that they plan to replace parts associated with the accelerator.

- Slidell, LA, USA